Nice guy Syndrome?
If you're talking about nice guys who can't get the hot girls, well, all I'll say on that matter is sometimes it just pays to be a jerk. Idunno, I guess there's something about those sorts of girls that attracts them to guys who aren't afraid to step out of line.
Talking from personal experience there. Through most of high school I was one of those typical "loner girfriendless "nice guys"", and then came a minicab journey. Once the journey was over I enthusiastically said "come on guys, let's go" and then this one hot girl just stood in my way, facing away from me, hips cocked, mocking my enthusiasm. Not in the mood to put up with her shenanigans, I did the first thing to come to mind - I grabbed her ass. Yes. And as expected she jumped right out of the way in disgust, yelling at me, and I got off the bus as quick as possible. Suffice it to say that wouldn't be the last time I got to get that intimate with her. Sure, it mostly amounted to playful flirting and goosing rather than anything meaningful, but still, it was something, and I was content with it. So yeah, sometimes you just gotta make a bold move rather than just sit there wondering why nobody pays attention to a "nice guy" like you. It's one thing to be a nice person, but you have to actually do stuff for it to matter.
So... idunno, where was I going with that? Oh right, so Nice Guy Syndrome pretty much just amounts to an entitlement complex when you get right down to it.